fix(ngRepeat): correctly track elements even when the collection is initially undefined

Previously if the collection model was set to undefined on the first digest,
the repeater would get confused and not use the correct tracking function
for associating model with dom elements in the repeater.

Closes #4145
Closes #3964
docs(ngShowHide): improve clarity

Closes #4099
docs(guide/e2e-testing): Fix typo

Closes #4100
docs($http): fix adding default header to get request example

Initially, `$httpProvider.defaults.headers.get` is `undefined`, so
`$httpProvider.defaults.headers.get['My-Header']='value'` will throw an
error.

Closes #4101
docs(guide/$location): clarify $location service role

Clean up confusing use of the term URL to refer to $location as well as 'URL in the browser'.

Closes #4103
docs(guide/$location): provide a title for section about `replace()`

Closes #4104
docs(jqLite): fix typo

Closes #4105
docs(ngHref): fix formatting and clarify

Closes #4106
docs(guide/services): fix typo

Closes #4112
docs(docs.css): prevent `<code>` elements from wrapping

Closes #4114
fix($compile): work around issue in jQuery 1.10.2

jQuery 1.10.2 does not attach data to comment nodes, which previously broke `$compile`.
This changes how elements with "transclude element" and a controller are compiled to
avoid the issue.

Closes #3764